For water, at pressures below atmospheric;
A. Melting point rises slightly and boiling point drops markedly
B. Melting point rises markedly and boiling point drops markedly
C. Melting point drops slightly and boiling point drops markedly
D. Melting point drops slightly and boiling point drops slightly
Answer: Option A
This Question Belongs to Mechanical Engineering >> Steam Boilers, Engines, Nozzles And Turbines
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The expansion of steam in a nozzle follows
A. Carnot cycle
B. Rankine cycle
C. Joule cycle
D. Stirling cycle
A. Steam enters and exhausts through the same port
B. Steam enters at one end and exhausts at the centre
C. Steam enters at the centre and exhausts at the other end
D. None of the above
The mechanical draught _________ with the amount of smoke.
A. Increases
B. Decreases
C. Does not effect
D. None of these
A. Higher effectiveness of boiler
B. High calorific value coal being burnt
C. Fouling of heat transfer surfaces
D. Raising of steam temperature
Melting point rises slightly and boiling point drops markedly..We can easily understand from the pressure versus temperature diagram of water..Fusion curve for water is almost vertical so there is no any great change in melting point..But vaporisation curve is hyperbolic type do here is remarkable change in boiling point